CN117462310B

CN117462310B - Laminoplasty prosthesis

Info

Publication number: CN117462310B
Application number: CN202311781290.3A
Authority: CN
Inventors: 张玮楠; 丰荣杰; 李健
Original assignee: Beijing Libeier Bio Engineering Institute Co Ltd
Current assignee: Beijing Libeier Bio Engineering Institute Co Ltd
Priority date: 2023-12-22
Filing date: 2023-12-22
Publication date: 2024-04-12
Anticipated expiration: 2043-12-22
Also published as: CN117462310A

Abstract

The present invention provides a laminoplasty prosthesis comprising: the first vertebral plate is connected to the first end of the mounting seat, and can swing relative to the mounting seat; the second vertebral plate is connected to the second end of the mounting seat; the driving assembly is arranged on the mounting seat and comprises a first rotating shaft and a second rotating shaft, the first rotating shaft is connected with the first vertebral plate, a first gear is arranged on the first rotating shaft, and a second gear meshed with the first gear is arranged on the second rotating shaft; the first rotating piece is in driving fit with the first end of the second rotating shaft, and the first rotating piece can move along the axis direction parallel to the second rotating shaft; the first limiting assembly can move along the axial direction parallel to the second rotating shaft and is provided with a stop position for stopping the second gear from rotating and an avoidance position for avoiding the second gear. The technical scheme of the application effectively solves the problem that the stability of the vertebral plate can be affected due to unfixed angle of the vertebral plate prosthesis in the related technology.

Description

Laminoplasty prosthesis

Technical Field

The invention relates to the technical field of medical instruments, in particular to a vertebral lamina prosthesis.

Background

Laminoplasty is a type of cervical spinal decompression that does not require fusion and remains active. The posterior tension band can be reserved, and the patient is allowed to bear more physiological load. At the same time, laminoplasty retains the dorsal covered dura and, if necessary, allows for safe repair procedures. The operation mode is divided into a single door opening technology and a double door opening technology, wherein the single door opening technology is more popular, and the operation time is short because of the relative simplicity of the operation. Aiming at the vertebral body of the single door opening operation, if the door opening angle is too small, the decompression effect can not be achieved; if the angle is too large, the prosthetic side lamina may be entirely fractured.

In the related art, the laminectomy prosthesis includes two fixing plates connected to each other, and the two fixing plates can swing, and after implantation, the included angle between the two fixing plates is not fixed, so that the laminectomy effect can be affected, and the stability of the laminectomy can be affected.

Disclosure of Invention

The invention mainly aims to provide a vertebral plate prosthesis for solving the problem that the stability of a vertebral plate is affected due to the fact that the angle of the vertebral plate prosthesis is not fixed in the related art.

In order to achieve the above object, the present invention provides a laminoplasty prosthesis comprising: a mounting base; the first vertebral plate is connected to the first end of the mounting seat and can swing relative to the mounting seat; the second vertebral plate is connected with the second end of the mounting seat; the driving assembly is arranged on the mounting seat and comprises a first rotating shaft and a second rotating shaft, the first rotating shaft is connected with the first vertebral plate, a first gear is arranged on the first rotating shaft, and a second gear meshed with the first gear is arranged on the second rotating shaft; the first rotating piece is in driving fit with the first end of the second rotating shaft and can move along the axis direction parallel to the second rotating shaft; the first limiting assembly can move along the axial direction parallel to the second rotating shaft and is provided with a stop position for stopping the rotation of the second gear and an avoidance position for avoiding the second gear; the first rotating piece moves to push the first limiting assembly to move from the stopping position to the avoiding position.

Further, the laminoplasty prosthesis further comprises a mounting plate and a guide structure, wherein the mounting plate and the guide structure extend along the axial direction parallel to the second rotating shaft, the mounting plate is arranged on the mounting seat and located on the side portion of the first limiting assembly, and the guide structure is arranged between the mounting plate and the first limiting assembly.

Further, the guide structure comprises a guide block and a guide groove, one of the guide block and the guide groove is arranged on the mounting plate, and the other of the guide block and the guide groove is arranged on the first limiting component.

Further, the first spacing subassembly includes first body of rod and second body of rod, has the contained angle between first body of rod and the second body of rod, and one side that first body of rod towards the second gear is provided with the backstop piece, is provided with first spacing hole on the first lateral wall of mount pad, and the second body of rod movably sets up in first spacing hole.

Further, the laminoplasty prosthesis further includes a first resilient member coupled between the first rotatable member and the second rotatable shaft, the first resilient member exerting a force on the first rotatable member in a direction away from the mount.

Further, the vertebral lamina prosthesis further comprises a second limiting assembly and a second rotating piece, the second rotating piece is arranged at the second end of the second rotating shaft, the second limiting assembly and the first limiting assembly are oppositely arranged, a second limiting hole is formed in the second side wall of the mounting seat, the second limiting assembly and the second limiting hole are correspondingly arranged, the second gear comprises a first sub wheel and a second sub wheel, the first limiting assembly is matched with the first sub wheel, and the second limiting assembly is matched with the second sub wheel.

Further, the laminoplasty prosthesis further includes a second resilient member disposed between the first and second stop assemblies.

Further, the vertebral lamina prosthesis further comprises a first positioning column and a second positioning column, the first positioning column is connected with the first limiting component, the second positioning column is connected with the second limiting component, the first positioning column and the second positioning column are oppositely arranged and located between the first sub-wheel and the second sub-wheel, a space is reserved between the axis of the first rod body and the axis of the first positioning column, and the second elastic piece is connected between the first positioning column and the second positioning column.

Further, the mount pad includes the mounting box, and the first end setting of mounting box is at the portion of dodging that has the inside extension towards the mounting box, and first vertebral plate passes dodging the portion and inserts in the mounting box, and drive assembly, first spacing subassembly and second spacing subassembly all are located the mounting box, and first rotation piece and second rotation piece all are located the outside of mounting box.

Further, the second lamina is swingably disposed.

By applying the technical scheme of the invention, the first vertebral plate and the second vertebral plate are connected at two ends of the mounting seat, and the first vertebral plate can swing relative to the mounting seat. The driving assembly is arranged on the mounting seat and comprises a first rotating shaft and a second rotating shaft, the first rotating shaft is connected with the first vertebral plate, a first gear is arranged on the first rotating shaft, a second gear is arranged on the second rotating shaft, and the first gear is meshed with the second gear. The first rotating member is in driving engagement with the first end of the second rotating shaft, and the first rotating member is movable in an axial direction parallel to the second rotating shaft. The first limiting assembly can move along the axial direction parallel to the second rotating shaft, and has a stop position for stopping the rotation of the second gear and an avoidance position for avoiding the second gear. The first rotating piece moves to push the first limiting assembly to move from the stopping position to the avoiding position. Through foretell setting, first vertebral plate can realize the swing under drive assembly's effect, can restrict the position of first vertebral plate simultaneously under first spacing subassembly's effect, can make first vertebral plate stop in optional position, make the vertebral plate prosthesis not only can realize the regulation of angle and can realize the locking like this, and then improved the stability of vertebral plate prosthesis. Therefore, the technical scheme effectively solves the problem that the stability of the vertebral plate can be affected due to the unfixed angle of the vertebral plate prosthesis in the related technology.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:

FIG. 1 shows a schematic perspective view of an embodiment of a vertebral body prosthesis according to the present invention;

FIG. 2 shows a schematic top view of the vertebral body prosthesis of FIG. 1;

FIG. 3 shows an exploded view of the vertebral body prosthesis of FIG. 1;

FIG. 4 shows a schematic perspective view of the mounting seat of the vertebral body prosthesis of FIG. 1;

FIG. 5 shows an exploded view of the mount of FIG. 4;

FIG. 6 shows a partial enlarged view of the mount of FIG. 5;

FIG. 7 shows a schematic cross-sectional view of the mount of FIG. 4;

fig. 8 shows a partial structural perspective view of the mount of fig. 5.

Wherein the above figures include the following reference numerals:

10. a mounting base; 11. a first limiting hole; 12. a second limiting hole; 13. a mounting box; 131. an avoidance unit; 20. a first lamina; 30. a second lamina; 40. a drive assembly; 41. a first rotation shaft; 411. a first gear; 42. a second rotation shaft; 421. a second gear; 4211. a first sub-wheel; 4212. a second sub-wheel; 50. a first rotating member; 60. a first limit assembly; 61. a first rod body; 62. a second rod body; 71. a mounting plate; 72. a guide structure; 721. a guide block; 722. a guide groove; 73. a first elastic member; 81. the second limiting component; 82. a second rotating member; 83. a second elastic member; 84. a first positioning column; 85. and a second positioning column.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

As shown in fig. 1 to 3, in the present embodiment, the laminoplasty prosthesis includes: mount 10, first lamina 20, second lamina 30, drive assembly 40, first rotation member 50, and first stop assembly 60. The first lamina 20 is attached to a first end of the mount 10, and the first lamina 20 is capable of swinging relative to the mount 10. A second lamina 30 is attached to the second end of the mount 10. The driving assembly 40 is disposed on the mounting base 10, and the driving assembly 40 includes a first rotating shaft 41 and a second rotating shaft 42, wherein the first rotating shaft 41 is connected with the first vertebral plate 20, a first gear 411 is disposed on the first rotating shaft 41, and a second gear 421 meshed with the first gear 411 is disposed on the second rotating shaft 42. The first rotating member 50 is in driving engagement with the first end of the second rotating shaft 42, and the first rotating member 50 is movable in an axial direction parallel to the second rotating shaft 42. The first limiting assembly 60 is movable in an axial direction parallel to the second rotation shaft 42, and has a stop position to stop the rotation of the second gear 421 and a dodge position to dodge the second gear 421. Wherein, the first rotating member 50 moves to push the first limiting assembly 60 to move from the stop position to the avoiding position.

With the technical solution of the present embodiment, the first vertebral plate 20 and the second vertebral plate 30 are connected at two ends of the mounting base 10, and the first vertebral plate 20 can swing relative to the mounting base 10. The driving assembly 40 is disposed on the mounting base 10, the driving assembly 40 includes a first rotating shaft 41 and a second rotating shaft 42, the first rotating shaft 41 is connected with the first vertebral plate 20, a first gear 411 is disposed on the first rotating shaft 41, a second gear 421 is disposed on the second rotating shaft 42, and the first gear 411 is meshed with the second gear 421. The first rotating member 50 is in driving engagement with the first end of the second rotating shaft 42, and the first rotating member 50 is movable in an axial direction parallel to the second rotating shaft 42. The first limiting assembly 60 can move along the axial direction parallel to the second rotating shaft 42, and the first limiting assembly 60 has a stop position for stopping the rotation of the second gear 421 and an avoidance position for avoiding the second gear 421. The first rotating member 50 can push the first limiting assembly 60 to move from the stop position to the avoiding position. Through the above arrangement, the first lamina 20 can swing under the action of the driving component 40, and meanwhile, the first lamina 20 can be limited in position under the action of the first limiting component 60, i.e. the first lamina 20 can be stopped at any position, so that the lamina prosthesis can not only realize angle adjustment but also realize locking, and further the stability of the lamina prosthesis is improved. Therefore, the technical scheme of the embodiment effectively solves the problem that the stability of the vertebral plate can be affected due to the unfixed angle of the vertebral plate prosthesis in the related technology.

The first rotating piece is provided with an indicating part, the mounting seat is provided with angle scale marks which are divided into 0 degree, 30 degrees, 60 degrees and 90 degrees, and the indicating part can correspond to different angle scale values when the first rotating piece rotates.

As shown in fig. 3 to 7, in the present embodiment, the laminoplasty further includes a mounting plate 71 and a guide structure 72, each of the mounting plate 71 and the guide structure 72 extends in an axial direction parallel to the second rotation axis 42, the mounting plate 71 is disposed on the mounting base 10 and on a side of the first spacing assembly 60, and the guide structure 72 is disposed between the mounting plate 71 and the first spacing assembly 60. The mounting plate 71 is arranged to provide a mounting location for the guide structure 72, in particular the mounting plate 71 is fixedly arranged within the mounting block 10.

As shown in fig. 3 to 7, in the present embodiment, the guide structure 72 includes a guide block 721 and a guide groove 722, one of the guide block 721 and the guide groove 722 is provided on the mounting plate 71, and the other of the guide block 721 and the guide groove 722 is provided on the first limiting assembly 60. The guide blocks 721 and the guide grooves 722 are simple in structure, convenient to set, and capable of ensuring that the moving direction of the first limiting assembly 60 is fixed.

Specifically, the distance of the opening of the guide groove 722 is smaller than the distance between the opposite inner walls of the guide groove 722, so that the first spacing assembly 60 and the mounting plate 71 are connected by the guide structure 72, and the mounting plate 71 and the first spacing assembly 60 can be prevented from being separated.

As shown in fig. 3 to 8, in the present embodiment, the first limiting component 60 includes a first rod 61 and a second rod 62, an included angle is formed between the first rod 61 and the second rod 62, a stop block is disposed on a side of the first rod 61 facing the second gear 421, a first limiting hole 11 is disposed on a first sidewall of the mounting base 10, and the second rod 62 is movably disposed in the first limiting hole 11. The guiding structure 72 is disposed on the first rod 61, and the structural area of the second rod 62 and the first rotating member 50 is larger, so that the first rotating member 50 can better push the second rod 62, and the first limiting component 60 is separated from the second gear 421.

Specifically, the cross-sectional area of the first rod body 61 gradually decreases from the direction approaching the second gear 421 to the direction separating from the second gear 421, and a stopper is provided on the side of the first rod body 61 toward the second gear 421, the stopper being capable of being interposed between adjacent two tooth surfaces on the second gear 421.

As shown in fig. 3 to 8, in the present embodiment, the laminoplasty prosthesis further includes a first elastic member 73, the first elastic member 73 being connected between the first rotating member 50 and the second rotating shaft 42, the first elastic member 73 applying a force to the first rotating member 50 in a direction away from the mount 10. The above arrangement can prevent the first rotating member 50 from being erroneously pressed to separate the first limiting member 60 from the second gear 421, i.e., the first elastic member 73 can ensure the locking of the first limiting member 60 and the second gear 421.

As shown in fig. 3 to 8, in the present embodiment, the laminectomy prosthesis further includes a second limiting assembly 81 and a second rotating member 82, the second rotating member 82 is disposed at a second end of the second rotating shaft 42, the second limiting assembly 81 and the first limiting assembly 60 are disposed opposite to each other, a second limiting hole 12 is disposed on a second side wall of the mounting seat, the second limiting assembly 81 and the second limiting hole 12 are disposed corresponding to each other, the second gear 421 includes a first sub-wheel 4211 and a second sub-wheel 4212, the first limiting assembly 60 is engaged with the first sub-wheel 4211, and the second limiting assembly 81 is engaged with the second sub-wheel 4212. The first spacing subassembly 60 and the spacing cooperation of first sub-wheel 4211, the spacing cooperation of second spacing subassembly 81 and second sub-wheel 4212 can make spacing effect better like this, only when simultaneously extrudeed first rotating member 50 and second rotating member 82, can make first spacing subassembly 60 and first sub-wheel 4211 separation and the spacing subassembly of second 81 and second sub-wheel 4212 separation simultaneously, just can drive second axis of rotation 42 this moment, and then drive first axis of rotation 41 and rotate, can further play the effect that prevents the maloperation like this.

Likewise, the guiding structure 72 is further disposed between the second limiting component 81 and the mounting plate 71, so that the movement of the second limiting component 81 is also relatively stable.

Specifically, the second limiting component 81 includes a third rod body and a fourth rod body, where the third rod body and the fourth rod body are vertically arranged, and the fourth rod body is matched with the second rotating member 82, that is, the second rotating member 82 can squeeze the fourth rod body and push the fourth rod body to move.

As shown in fig. 3 to 8, in the present embodiment, the laminoplasty prosthesis further includes a second elastic member 83, and the second elastic member 83 is disposed between the first spacing assembly 60 and the second spacing assembly 81. The second elastic member 83 supports the first limiting assembly 60 and the second limiting assembly 81, that is, the second elastic member 83 can prevent the first limiting assembly 60 and the second limiting assembly 81 from approaching each other, so that the locking effect of the first limiting assembly 60 and the first sub-wheel 4211 and the locking effect of the second limiting assembly 81 and the second sub-wheel 4212 can be further ensured.

As shown in fig. 3 to 8, in the present embodiment, the laminoplasty prosthesis further includes a first positioning column 84 and a second positioning column 85, the first positioning column 84 is connected with the first limiting assembly 60, the second positioning column 85 is connected with the second limiting assembly 81, the first positioning column 84 and the second positioning column 85 are disposed opposite to each other and located between the first sub-wheel 4211 and the second sub-wheel 4212, a space is provided between an axis of the first rod body 61 and an axis of the first positioning column 84, and the second elastic member 83 is connected between the first positioning column 84 and the second positioning column 85. The arrangement of the first positioning column 84 and the second positioning column 85 can make the position of the second elastic member 83 relatively stable, and since the second elastic member 83 is located between the first sub-wheel 4211 and the second sub-wheel 4212, the second elastic member 83 can be prevented from interfering with the guiding structure 72, so that the overall movement is relatively stable.

As shown in fig. 3 to 8, in the present embodiment, the mounting seat 10 includes the mounting box 13, the first end of the mounting box 13 is provided with the avoiding portion 131 extending toward the inside of the mounting box 13, the first vertebral plate 20 passes through the avoiding portion 131 and is inserted into the mounting box 13, the driving assembly 40, the first limiting assembly 60 and the second limiting assembly 81 are all located in the mounting box 13, and the first rotating member 50 and the second rotating member 82 are all located outside the mounting box 13. The above-described arrangement of the avoidance portion 131 can effectively avoid the first lamina 20, and thus can prevent interference between the first lamina and the mounting box 13.

In the embodiment not shown in the drawings, the first recess and the second recess are provided on the opposite side walls of the mounting case 13, the first recess and the first rotating member 50 are provided correspondingly, the second recess and the second rotating member 82 are provided correspondingly, and when the first rotating member 50 and the second rotating member 82 approach each other, the first rotating member 50 can enter the first recess, and the second rotating member 82 can enter the second recess. This can make the positions of the first rotating member 50 and the second rotating member 82 more stable.

The second lamina 30 is swingably disposed. The second lamina 30 is driven in the same manner as the first lamina 20.

Specifically, in this embodiment, the second lamina 30 comprises a bent plate comprising a first plate segment and a second plate segment, the first plate segment being positioned between the second plate segment and the mounting base 10, an included angle being formed between the first plate segment and the second plate segment, and the second plate segment extending in opposite directions. The above-described bending plate can likewise be connected to the vertebral body, i.e. the first vertebral plate 20 and the bending plate are located on both sides of the opening in the vertebral body, respectively, so that the position and the size of the opening in the vertebral body can be ensured.

The second lamina 30 further comprises a first connecting plate and a second connecting plate, the first connecting plate is connected with the second plate section, a first accommodating space is arranged in the second plate section, the first accommodating space extends along the length direction of the second plate section, a second accommodating space is arranged in the first connecting plate, the second accommodating space is communicated with the first accommodating space, the lamina prosthesis further comprises a third elastic piece and a connecting piece, the third elastic piece is connected between the first end of the connecting piece and the side wall of the first accommodating space far away from the second accommodating space, the second end of the connecting piece penetrates through the second accommodating space and is connected with the second connecting plate, and the second connecting plate can be close to or far away from the first connecting plate. The second connecting plate comprises a third plate section and a fourth plate section, an included angle is formed between the third plate section and the fourth plate section, and meanwhile, a U-shaped groove is formed among the fourth plate section, the third plate section, the first connecting plate and the second plate section and is inserted into an opening of the vertebral body, namely, the second plate section and the fourth plate section are respectively positioned at the inner side and the outer side of the vertebral body. Simultaneously can realize being close to each other or keeping away from each other between fourth board section and the second board section under the effect of connecting piece, and then can clip the centrum effectively, and then can make the stability of being connected of second lamina 30 and centrum better.

The extending direction of the first accommodating space and the extending direction of the second accommodating space are perpendicular, the guide wheel is arranged at the intersection of the first accommodating space and the second accommodating space, and the connecting piece is wound on the guide wheel, so that the connecting piece can move more easily.

Meanwhile, it should be noted that, since the fourth plate section and the second plate section can be close to each other or far away from each other, the second vertebral plate 30 can adapt to vertebral bodies with different sizes, i.e. can be aimed at vertebral bodies with different thicknesses.

The first connecting plate and the second connecting plate are provided with a space therebetween, the vertebral plate prosthesis further comprises a fourth elastic piece, the fourth elastic piece is arranged between the first connecting plate and the second connecting plate, and the connecting piece is provided with scale values. Under the action of the fourth elastic element, the first connecting plate and the second connecting plate can be further connected together, and the fourth elastic element can pull the first connecting plate and the second connecting plate closer together, so that the second vertebral plate 30 can clamp the vertebral body more easily. Meanwhile, the scale values can be set to effectively read, so that more data can be obtained, and corresponding products can be conveniently processed later.

Specifically, under the effect of third elastic component and fourth elastic component, can draw first connecting plate and second connecting plate all the time, and then make the stability of centre gripping better.

The use process of the laminoplasty prosthesis of this embodiment is as follows:

simultaneously, the first rotating member 50 and the second rotating member 82 are extruded, so that the first rotating member 50 and the second rotating member 82 respectively push against the first limiting component 60 and the second limiting component 81, the first limiting component 60 and the second limiting component 81 are close to each other, the first limiting component 60 and the first sub-wheel 4211 are respectively separated, and the second limiting component 81 and the second sub-wheel 4212 are separated, and thus the first rotating member 50 and the second rotating member 82 are synchronously rotated, the second rotating shaft 42 can be driven to rotate, the first rotating shaft 41 is driven to rotate, and meanwhile the first vertebral plate 20 can be driven to swing. When the first lamina 20 reaches the preset angle, the first rotating member 50 and the second rotating member 82 are released at the same time, the first elastic member 73 pushes the first rotating member 50 and the second rotating member 82 away from each other, and the first limiting assembly 60 and the second limiting assembly 81 are separated from each other under the action of the second elastic member 83, so that the first limiting assembly 60 and the first sub-wheel 4211 are in locking engagement, and the second limiting assembly 81 and the second sub-wheel 4212 are in locking engagement.

In the description of the present invention, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present invention and simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present invention; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present invention.

The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A laminoplasty prosthesis comprising:

a mounting base (10);

a first lamina (20) connected to a first end of the mount (10), the first lamina (20) being capable of swinging relative to the mount (10);

a second lamina (30) connected to the second end of the mount (10);

the driving assembly (40) is arranged on the mounting seat (10), the driving assembly (40) comprises a first rotating shaft (41) and a second rotating shaft (42), the first rotating shaft (41) is connected with the first vertebral plate (20), a first gear (411) is arranged on the first rotating shaft (41), and a second gear (421) meshed with the first gear (411) is arranged on the second rotating shaft (42);

a first rotating member (50) in driving engagement with a first end of the second rotating shaft (42), the first rotating member (50) being movable in an axial direction parallel to the second rotating shaft (42);

the first limiting assembly (60) can move along the axis direction parallel to the second rotating shaft (42) and is provided with a stop position for stopping the rotation of the second gear (421) and a avoiding position for avoiding the second gear (421);

wherein the first rotating member (50) moves to push the first limiting assembly (60) from the stop position to the avoidance position;

the laminoplasty also comprises a mounting plate (71) and a guide structure (72), wherein the mounting plate (71) and the guide structure (72) both extend along the axial direction parallel to the second rotating shaft (42), the mounting plate (71) is arranged on the mounting seat (10) and positioned at the side part of the first limiting assembly (60), and the guide structure (72) is arranged between the mounting plate (71) and the first limiting assembly (60);

the guide structure (72) comprises a guide block (721) and a guide groove (722), one of the guide block (721) and the guide groove (722) is arranged on the mounting plate (71), and the other of the guide block (721) and the guide groove (722) is arranged on the first limiting assembly (60);

the first limiting assembly (60) comprises a first rod body (61) and a second rod body (62), an included angle is formed between the first rod body (61) and the second rod body (62), one side of the first rod body (61) facing the second gear (421) is provided with a stop block, a first limiting hole (11) is formed in the first side wall of the mounting seat (10), and the second rod body (62) is movably arranged in the first limiting hole (11).

2. The lamina prosthesis according to claim 1, further comprising a first elastic member (73), the first elastic member (73) being connected between the first rotational member (50) and the second rotational shaft (42), the first elastic member (73) exerting a force on the first rotational member (50) in a direction away from the mount (10).

3. The lamina prosthesis according to claim 1, further comprising a second limiting assembly (81) and a second rotating member (82), wherein the second rotating member (82) is disposed at a second end of the second rotating shaft (42), the second limiting assembly (81) and the first limiting assembly (60) are disposed opposite to each other, a second limiting hole (12) is disposed on a second side wall of the mounting seat, the second limiting assembly (81) and the second limiting hole (12) are disposed correspondingly, the second gear (421) comprises a first sub-wheel (4211) and a second sub-wheel (4212), the first limiting assembly (60) is engaged with the first sub-wheel (4211), and the second limiting assembly (81) is engaged with the second sub-wheel (4212).

4. A laminar prosthesis according to claim 3, characterized in that it further comprises a second elastic element (83), said second elastic element (83) being arranged between said first stop assembly (60) and said second stop assembly (81).

5. The lamina prosthesis according to claim 4, further comprising a first positioning post (84) and a second positioning post (85), the first positioning post (84) being connected to the first stop assembly (60), the second positioning post (85) being connected to the second stop assembly (81), the first positioning post (84) and the second positioning post (85) being disposed opposite each other and between the first sub-wheel (4211) and the second sub-wheel (4212), an interval being provided between an axis of the first rod (61) and an axis of the first positioning post (84), the second elastic member (83) being connected between the first positioning post (84) and the second positioning post (85).

6. A laminar prosthesis according to claim 3, characterized in that the mounting seat (10) comprises a mounting box (13), the first end of the mounting box (13) is provided with a avoidance portion (131) extending towards the inside of the mounting box (13), the first lamina (20) passes through the avoidance portion (131) and is inserted into the mounting box (13), the driving assembly (40), the first limiting assembly (60) and the second limiting assembly (81) are all located in the mounting box (13), and the first rotating member (50) and the second rotating member (82) are all located outside the mounting box (13).

7. The laminoplasty prosthesis according to any one of claims 1 to 6, wherein the second lamina (30) is swingably disposed.